Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
van cua » vang cua, ban cua, dan cua
cac tuc » cac toc, cac tu, cac tac
van cac » van hac, van cau, van bac
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
te sai » te tai, te bai, te lai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ((ky tang) OR (ky dang)) ma hoa. hieu van cac tuc ((va doanh) OR (vay doanh)) van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ((ky tang) or (ky dang)) ma hoa. hieu van cac tuc ((va doanh) OR (vay doanh)) van cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sai ((ky tang) or (ky dang)) ma hoa. hieu van cac tuc ((va doanh) OR (vay doanh)) van cua tre*.